numpy.assert_raises -> dask.raises
numpy.assert_raises -> dask.raises

This avoids a nose dependency in numpy

PhE/dask,clarkfitzg/dask,jakirkham/dask,jcrist/dask,dask/dask,mraspaud/dask,freeman-lab/dask,vikhyat/dask,mrocklin/dask,wiso/dask,cpcloud/dask,mraspaud/dask,ssanderson/dask,clarkfitzg/dask,mrocklin/dask,ContinuumIO/dask,freeman-lab/dask,chrisbarber/dask,jayhetee/dask,jcrist/dask,vikhyat/dask,blaze/dask,jayhetee/dask,pombredanne/dask,ContinuumIO/dask,jakirkham/dask,mikegraham/dask,PhE/dask,simudream/dask,wiso/dask,simudream/dask,pombredanne/dask,cowlicks/dask,gameduell/dask,ssanderson/dask,blaze/dask,dask/dask